Valve mechanism



I Jul 39, 1924;

' 1,502,736 W. D. MERQER VALVE MECHANISM Filed April 11 1923 v Tram/Fm.

Patented July 29, 1924,

WILLIAM D. MERCER, OF DETROIT, MICHIGAN, ASSIGNOB flO KEL'VINATORCORPORA- TION, F DETROIT, MICHIGAN, A CORPORATION" OF DELAWARE.

VALVE MECHANISM.

Application filed April 11, 1923. Serial No. 631,483.

To all whom it may concern. ing an integral part of a'valve mounting Beit known that I, WILLIAM I). MERCER, 23 which comprises in addition tothe spider a citizen of the UnitedStates, residing at 22 a cylindricalportion 24 open at its lower Detroit, in the county of Wayne and Stateend 25 to receive the valve stem 26 of 2 pi Michigan, have invented acertain new valve 27 adapted to seat in the valve seat so and usefulImprovement in Valve Mechaof the plate 17 and closed at its upper hism,of which the following is a full, clear, end 28 to form with the valvestem 26 a and exact description, reference being had chamber 29 adaptedto act as a dash pot to to the accompanying drawin s.' cushion themovement of theivalve 27 rela- My invention relates to va ve mechanismtive to the valve mounting 23. The valve es and particularly to valvemechanism for 27 is biased to closed position by a relatively use in gascompressors. In these com-- light spring 80 and limited in its openingpressors it is desirable to provide means by movement by engagement ofits upper face which the discharge valve from the com- 31 with the lowerend of the tube 24: pressor chamber may open an abnormal while theentire valve mounting 23 is biased T0 amount to readily discharge anyliquid to valve closing position by a relatively such as oil which mayaccumulate in the strong spring 32. compressor chamber and in this wayre- It will be apparent from the above delieve the compressor chamberand other scription that the valve 27 is free to open parts from unduestrain. In providing such a normal amount in response to any presmeansit has been customary in certain sure sufiicient to overcome therelatively makes of compressors to mount the valve light spring 30, thatthis movement is in a movable support arranged to remain limited b theengagement of the upper stationary under normal operation but to face 310 the valve 27 with=-thelower end yield under an abnormal pressure.While '25 of the tube 24 of the valve mounting so this construction hasbeen found satisfactory 23, that further opening movement of the ingeneralvarious features seem to admit valve 27 is possible by upwardmovement of of 1m rcvement and myinvention .is par the entire valvemounting 23 in response to ticulai 'ly desirable to accomplish this.impressure suiiicient to oyercome the action of provement. therelatively strong spring 32, and. that In the drawings accompanying thismovement'oi the valve 27 relative to the specification and forming apart thereof I vvalve mounting 23 is cushioned in both dihave shown, forpurpose of illustration, one rections so that hammering of the upperform which my invention may assume. In face 31 of the valve 27 againstthe lower these drawings: end of the tube 24 and of the valve 27 9oFigure 1 represents a section through 3, against the-seat 20 isprevented. compressor showing this illustrative form of Those skilled inthe art will recognize that my invention; various modifications andconstruction may Figure 2 is a section on theline 2-2 of be made withoutdeparting from the essence Fi l; of my invention and accordingly thisdis- Figure 3 is an enlar ed detail showing closure is illustrative onlyand my invention the valve mechanism of igure 1, while is not limitedthereto Figure a is a further enlarged'cletail show- I clann:

ing portions of the mechanism shown in 1. Valve mechanism comprising avalve Figure housing, a valve mountine mov'ably support- 1109 In thedrawings I have shown a piston ed therein, biased toward valve closingpo- 11 operate'dby means of a connecting rod sition, and providedcentrally with a tubu- 12 ina cylinder 13 provided with inlet ports larguide, a valve, having its stem mounted 14 and surmounted by a cylinderhead 15 in said guide and arranged to form with to which. is secured bymeans of bolts 16 an said guide a chamber cushionin'gthe movewe outletduct comprising a plate 17 and a casment of said valve in at least onedirection, ing 18. Clamped between this plate 17 and biased to closedposition, forming with said the cylinder 11 is a valve housing 19commounting means to limit the opening moveprising a valve seat 20 and atube 21 ar.- ment of said valve relative to said mounting,

ranged to slidably support a sp der 22 formand having its stem prov1dedwith grooves 2. Valve mechanism comprising a valvehousing, a valvemounting movably supported therein and biased to one position, and avalve supported in said mounting and biased to corresponding position,said mounting and said valve beingso formed that movement of said valverelative to said mounting is limited and that a permanently closedchamber is formed between saidmounting and said valve efl'ective toretard movement of said valve in at least one direction. a

3. Valve mechanism comprising a valve housing, a valve mounting movablysupv ported therein, biased-toward valve closing position, and providedcentrally with a tubular guide, a valve having its stem mounted in saidguide, arran ed to form vvithsaid guide a chamber'cus ioning the.movement of said valve in at least one direction, biased toclosedposition, and forming with said mounting means to limit the openingmovement of said mounting.

4. In a m eompressor, the combination with a mem engbdgted to form anoutlet from said compressorgigf a valve seated upon said ported memberand controlling said outlet, a spring, housed within said ported member,seating said valve, and designed to yield under a predetermined gaseouspressure, a. movable abutment for said spring seated upon said portedmember, telescoping stems upon said valve and said abutmentmemberlimiting the normal opening movement of the valve and forming a chamberadapted to cushion the movement of said valve relative to said abutmentin at least one direction, and a relatively strong spring resistingmovement of said abutment and yieldpressure on saidf valveto permit anincreased opening there able under an abnormal of. v

Intestimony whereof, I hereunto afiix my signature. v v WILLIAM D.MERCER.

valve relative to said

